Telephone system and apparatus



A. E. KEITH. TELEPHONE SYSTEM AND APPARATUS.

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APPLICATION FILED APR. '2. I906- A. E. KEITH.

TELEPHONE SYSTEM AND APPARATUS.

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Patented June 24, 1919.

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1,307,977. APPLICATION flLEl) APR. 12. I906.

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A. E. KEITH.

TELEPHONE svsmn AND APPARATUS.

APPLICATION FILED APR. 12. 1906.

1 ,307,977. Patented June 24, 1919.

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A. E. KEITH.

TELEPHONE SYSTEM AND APPARATUS.

APPLICATION FiLED APR. 12. 1906. 1,307,977, Patented June 24, 1919.

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APPLICATION FILED APR. 12 I905- Patented June 24,1919.

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A. E. KEITH.

TELEPHONE SYSTEM AND APPARATUS.

APPLICATION mu) APR. 12. 1906.

1 ,307, 977. Patented June 24, 1919 I9 SHEETSSHEET B A. E. KEITH.

TELEPHUNE SYSTEM AND APPARATUS.

APPLICATION FILED APR. 12. I906.

1,307,977. Patented June 24,1919.

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A. E. KEITH.

TELEPHONE SYSTEM AND APPARATUS.

KPPUCATIUH FILED APR-12.1906- 1,307,977. Patent/ed June 24, 1919.

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A. E. KEITH. TELEPHONE SYSTEM AND APPARATUS.

APPLICATION FILED APRIL 1906.

Patented June 24, 1919.

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TELEPHONE SYSTEM AND APPARATUS.

APPLICATiON HLEU APR.12. 906.

Patented June 24. 1919.

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A; E. KEITH.

TELEPHONE SYSTEM AND APPARATUS.

APPLICATION FILED APR. l2. I905.

1,307, 977. Patented June 24, 1919.

I9 SHEET5-SHEET II- A. E. KEHH.

TELEPHONE SYSTEM AND APPARATUS.

APPLICATION FILED APR. 12. I906.

l 307, 977 Patented J 11110 24, 1919.

A. E. KEITH. TELEPHONE SYSTEM AND APPARATUS.

APPLICATION FIUZD APR. 12, I906. Pam Ema 24 I9 SHEETS-SHEET l3.

A. E. KEITH.

TELEPHONE SYSTEM AND APPARATUS.

APPLICATION men APR. 12, I906.

1 ,307,977. Patented June 24, 1919.

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TELEPHONE SYSTEM AND APPARATUS.

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Patented June 24, 1919.

I9 SHEETS-SHEET :5.

A. E. KEITH.

TELEPHONE SYSTEM AND APPARATUS.

' APPLICATION mm APR. 12. I906.

Patented June 24, 1919.

19 SHEETS-SHEET l6.

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Patented June 24, 1919.

9 SHEETSSHEET ll- A. E KEITH.

TELEPHONE SYSTEM AND APPARATUS:

APPLICATION mu) APR. 12. 1906.

1 ,307,977. Patented J une 2-1, 1919.

A. E. KEITH.

TELEPHBNE SYSTEM AND APPARATUS.

APPLICATION FILED APR, l2. I905.

1 ,307 ,977. v Patented June 24, 1919.

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fly. 32.

UNITED STATES PATENT OFFICE.

ALEXANDER E. KEITH, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO AUTOMATIC ELECTRIC COMPANY, A CORPORATION OF ILLINOIS.

TELEPHONE SYSTEM AND APPARATUS.

Application filed April 12. 1906.

To n/l w/mm it may concern l e it known that l, Annxannnn E. Knrrn, a citizen of the United States of America, and resident: of Chicago, Cook county, Illinois. have invented a certain new and useful improvement in Telephone Systems and Apparatus, of which the following is aspeciticatiou.

My invention relates to automatic or senii-automatic telephone systems in general. It relates more particularly to automatic or semi-autoinatic telephone systems it. which either part or all of the exclnmge switching apparatus is controllable and operable by the subscribers through the medium ol Hi2]lLL tHHl-lIINIk or impulse-translnitting devices located at the subscribers sub-stati ms. Telephone switching machincry for this purpose is ordinarily operated on the stepby-step principle. Consequently, the calling subscriber obtains the desired conma-tion by simply transmitting electrical current impulses corresponding to the digits of the number of the called subscrio ers sub-station. provided the exchange be ot the full automatic type. If only semiautomatic in character only part of the general operation (it connecting up the two urbsrribers lines will be accomplished directly by the calling subscriber.

Generally stated. the object of my invention is the provision of an improved and highly etticient automatic or semiautomatic telephone exchange system.

Special objects of my invention are the provision of improved automatic switching nnichincry For the exchange or central station; the provision of improved individual switches for the subscribers lines-that is to say, switches each of which is individual lo a subscribers telephone line and adapted to be employed by the subscriber for performing a trunking operation preliminary to the trunking operation or operations which correspond to the first digit of the called munber; the provision of an improved mnstruction and arrangement whereby an automatic telephone system may be divided into a main or central exchange, a plurality of auxiliary or sub-exchange stations connected by trunk-line cables with the main or central station, and a plurality of subscribers substations connected by individual telephone lines with the said auxiliary or sub-exchange stations; and the provision of certain details and features of Specification of Letters Patent.

Patented June 24. 1919.

Serial No. 311.327.

improvement tending to increase the gen eral etiiciency and serviceability of a tele phone system of this particular character.

In certain respects it will be seen that my invention is in the nature of an improvcment on the telephone system disclosed in my prior application. Serial No. 229,373. tiled in the United States Patent Utiicc October 21. 1904. Also. in certain respects it will be seen that my invention is in the nature of an improvement on the individual-switch and system set Forth in my prior application. Serial No. 258.026. tiled in the United States Patent ()tiiee April 29. 1903.

It will also be understood, ot course. that it is an object of my invention. as will hereinatter more fully appear. to provide certain novel combinations and circuit arrangements tending to increase the etficiency of a telephone system.

To the foregoing and other useful ends my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings. Figure 1 is a top plan view of one of the individualswitches secured to an angle-iron perpendicularly disposed to form a switeh supporting rack-board or unit. In front ot each switch there is provided a bank of trunk-line terminals, the structure of which is shown in cross-section in Figs. 2 and 3. Over said bank the said switch cXel'ciscs control through the medium of a forwardlyextending arm which pivotally supports a circuit-closing plunger.

Fig. t is an enlarged view of the bankengaging terminal of the plunger.

Figs. 5, G, 7, 8 and 9 are details of the bank.

Fig. 2, as stated, is a section of bank and is taken on the line 2-2 of the bank shown in Fig, 1. The bank-springs are shown disengaged, and the plunger just at the point. of entering into the bank. which plunger (in Fig. 3) is shown. driven home. having thus seized a trunk-line.

Fig. 10 shows a top view of the master switch or switch-operating machine secured to one of the auglc irons ot the board strnc ture, and discloses a step-by-stcp operative device comprising a pawl and ratchet wheel, together with a cam, wiper and bank of contacts.

Fig. 11 is a section on the line ]1t1 ot Fig. 10 showing the structure of the bank and wiper. 

